Eccentric follower mechanism



y 3, 1950 G. B. WOOD, JR 2,508,557

ECCENTRIC FOLLOWER MECHANISM Filed Nov. 5, 19 3 Shee'ts-Sheet 1 INVENTOR. GEORGE E. wooD R.

ATT'OPNEY.

May 23, 1950 e. B. WOOD, JR 2,508,557

ECCENTRIC FOLLOWER MECHANISM Filed Nov. 15, 1946 3 Sheets-Sheet 2 INVENTOR. GEOEGE 15. WOOD, J12.

ZWM%M AT TOP/V5 Y.

Patented May 23, 1950 UN I'TE D S TAT ES PATENT F Fl-CE ECCENTRIC. FOLLOWER MECHANISM.;.

George mLJn, sprin fiekL-Ma a, assi nmto American Bosch Corporation, $pringiigl d'. Mass, a corporation of New York 7 A plication Novem er 5, ilfiy eria flo- 7,119,091 a Cla ms- 1 I Thisinvention relates "to a new and. improved eccentric follower mechanism and more particu larly to a relatively compact, lightweight, rugged eccentric follower mechanism which will stand greater load than roller mechanism of .comparable bulk, weight and. inertia of the moving parts. An object of the invention is to make a relatively compact, lightweight, rugged eccentric follower mechanism wherein the parts are retained in assembled relation for handling;

Another object of the invention is to provide a new andv improved follower mechanism of the type set forth wherein the center about which the .shoe pivots is retained close to the face of the shoe.

Another object of the invention is to provide an eccentric follower mechanism of the type set forth which employs a relatively. small rocker pin .and wherein the bearing is obtained along the full length of .the top and bottom of the rocker pin therebyproviding a maximum bearing-area with a relatively small pin.

Other objects and advantages of the invention will be apparent from the following description taken in connection with the accompanying drawings. It will be understood that many changes may be made in the details of construction and arrangement of parts without departing from the scope of the invention as expressed in the accompanying claims, the preferred form of the invention having been given by way of illustration only.

Referring to the drawings:

Fig. 1 is a side view, partially in section, of a follower mechanism embodying the invention;

Fig. 2 is a fragmentary end view of the device shown in Fig. 1;

Fig. 3 is a sectional view taken on line 3-3 of Fig. 2 looking in the direction of the arrows;

Fig. 4 is an exploded view of the follower mechanism but showing the side thereof similar to Fig. 1; and

Fig. 5 is an exploded view of the parts shown in Fig. 4.

Referring more particularly to the drawings, wherein similar reference characters designate corresponding parts throughout the several views, the arrangement shown embodying the invention comprises the eccentric or cam I on the shaft 2 and adapted to be rotated or oscillated by the movement of said shaft 2.

The eccentric follower mechanism embodying the present invention comprises the shoe 3, rocker pin 4 and tappet 5.

The shoe 3 has the follower surface 8 adapted to engage the surfaoehf theleccentric I and where the ap r u i o be U d W r t tin c entric or cam I, the relief In ay be provided.

The shoe 3 has, at its opposite ends,.projections or ears sand the bore .9 in which the rockerpin 4 is da d- 0 be ositio d. Th b re 9. h us thev projections Bfis ofsuch sizethat theprojctions 8 envelop therock enpin A and the .tappet 5 has. the central portions. 1.0 having. the bore .il also adapted lie-envelop. therockeripin .4, so that when the shoe; and tappeii are in assembled relation and the pin 4, slid intooperativeposition through thealignedboresll II J, the parts will be retained in operative relation.

Except for. theecentral area. or portions, 5 v of the tappet 5 andthe edge portionsor areas, 3 of h s ath adiaee tserfa e o port n at h ppet a i oemay e onmed q d s contour or shape so long assthey allow.enveloprnent o in .4 a de Q lbedabciie-anddo no ou and t eb .all w cl arance @9 r ea i on increment d thea hoe .3. unonmovement of th eccentric I.

The collar I2 prevents the rocker pin 4 from sliding out of the aligned bores 9 and II and is retained in position by the coil spring l3 which engages the lower surface of said collar i2 and at its other end engages the wall of the annular opening i l in the guide l5 which has a central bore adapted to receive an extension IE on the tappet 5. The housing I! and holding pin i8 are provided for retaining the parts in position as shown in Fig. 1.

As shown in detail in Fig. 3, the surface ill of the shoe 3 could be a plane surface and the adjacent surface 20 of the tappet 5 could be a conical or curved surface to allow free action of the shoe 3 relative to the tappet 5 as described above.

From the above it will be seen that with the present construction a relatively compact, lightweight, rugged eccentric follower mechanism may be constructed which will stand greater load than a roller mechanism of comparable bulk, weight and inertia of the moving parts, and that in the present construction a maximum bearing area along the full length of the top and bottom of the rocker pin 4 will be obtained, thus providing maximum bearing area with a relatively small rocker pin and that by forming portions of the shoe 3 and tappet '5 to envelop the rocker pin 4, that the parts will be retained in assembled relation for handling.

From the foregoing it will be seen that I have provided simple, efliclent and economical means 3 for obtaining all of the objects and advantages of the invention.

Having described my invention, I claim:

1. An eccentric follower mechanism having a shoe and a tappet which are joined by a pin which is sufiiciently enveloped by both said shoe and said tappet to retain the parts in assembled relation and which pin has substantially full length contact in said shoe and said tappet.

2. An eccentric follower mechanism comprising i a pin, a shoe having a portion adapted to engage a cam, a tappet having a portion adjacent said shoe and said pin having portions thereof sufficiently enveloped by said shoe and said tappet to retain the parts in assembled relation.

3. Aneccentric follower mechanism comprising'a pin, a shoe having a portion adapted to engage a cam, a tappet having a portion adjacent said shoe and said pin having portions thereof sufiiciently enveloped by said shoe and said tappet to retain the shoe and tappet in assembled relation, said pin having substantially full length bearing in said shoe and said tappet.

4. An eccentric follower mechanism comprising a pin, a shoe having a portion adapted to engage a cam, a tappet having a portion adjacent said shoe and said pin having portions thereof partially enveloped by said shoe and said tappet, said pin having substantially full length bearing along one side thereof with said shoe and along its opposite side with said tappet.

5. An eccentric follower mechanism comprising a shoe and atappet, and a rocker pin engaging said shoe and tappet to retain the same in assembled relation, said rocker pin being sufiiciently enveloped by said shoe and said tappet to retain the parts in assembled relation and said pin having substantially full length bearing in said shoe and in said tappet.

6. An eccentric follower mechanism comprising a shoe and a tappet, a pin member for retaining said parts in assembled relation, said shoe and iii 4 said tappet having portions partially enveloping said pin, and having portions of such contour as to allow free, relative movement of said shoe and tappet, said pin having substantially full length bearing in both said shoe and said tappet.

'7. An eccentric follower mechanism comprising a pin, a shoe having a portion adapted to engage a cam, a tappet having a portion adjacent said shoe, said pin having portions thereof sufliciently enveloped by said shoe and said tappet to retain the parts in assembled relation, said pin having substantially full length bearing in both said shoe and said tappet and means adjacent the opposite ends of said pin for retaining said pin in said assembled position.

8. An eccentric follower mechanism comprising a pin, a shoe having a portion adapted to engage a cam, a tappet having a portion adjacent said shoe, said pin having portions thereof suificiently enveloped by said shoe and said tappet to retain the parts in assembled relation, said pin having substantially full length bearing in both said shoe and said tappet and a ring having portions adjacent the opposite ends of said pin for retaining said pin in said assembled position.

GEORGE B. WOOD, JR-

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Spencer July 30, 1940 

